Friday, December 11, 2009

Luck


I couldn't find that much fruit in the cake. Wasn't the photographer who did the packaging lucky?

Crazy Folds

http://upload.wikimedia.org/wikipedia/he/f/fb/Nahal_pratzim_1.JPG

i checked the sand under magnification and it is small - probably to
small to be called a sand. it certainly is irregular enough to be
called shards. i guess you are right - it is pumice "sand". (that's
the second new sand i saw on this trip - the first was rock flour at
yosemite).
as far as the crazy folding. it's interesting how the explanation for
the phenomena changes and gets more sophisticated. this american
geology textbook from the 60's gives the simplest explanation. the
other explanations i have heard is slumping as a result of a earthquake
or differential changes in volume as a result of lithification (this
applies to these same types of folds in flint) and after the last san
francisco earthquake i heard about liquidifaction as an explanation.
now this seems the most logical but in 10 years who knows?
the connection to quick sand makes this explanation even more
attractive and your story of the dangers lurking for the driver on the
western side makes it dramatic. it is possible that a fossilized quick
sand pit(with fossils like the la brea tar pits) had been found but
not interrupted correctly. maybe that is the correct explanation for
some concentrations of dinosaur bones.

i hope that one day the site at mono lake will be expanded and preserved.


the weathered granite north of mono lake still others me. why was that
so weathered and not others granites saw? were the other outcrops
glaciated and this one wasn't. i guess that it is to high to be
affected by the salts of mono lake but was there hydrothermal activity
that accelerated the weathering.

Wednesday, December 9, 2009

CREATING VALUE


John Gibbon's Get a Grip on Physics is 75$ on Amazon but 5$ on Better Books
70$ added because it was in Tiger Wood's car.

In A Short History of Nearly Everything, Bill Bryson quotes from "a book by a geologist named Charles Hapgood" - The cheapest copy of that book is now 300$ (instead of 5$). (By the way - that author was a historian, not a geologist.)

In the same chapter(12), Bryson also quotes from a textbook. The edition quoted sells for 37$. Previous or later editions are 1.99.